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#include <cstdio>
using namespace std;
int mat[1030][1030],v1[1030],v2[1030],sol[1030];
int main()
{
freopen("cmlsc.in","r",stdin);
freopen("cmlsc.out","w",stdout);
int n,m,i,j,maxx;
scanf("%d%d",&n,&m);
for(i=1;i<=n;i++) scanf("%d",&v1[i]);
for(i=1;i<=m;i++) scanf("%d",&v2[i]);
for(i=1;i<=n;i++)
{
for(j=1;j<=m;j++)
{
if(v1[i]==v2[j]) mat[i][j]=mat[i-1][j-1]+1;
else
{
if(mat[i-1][j]>mat[i][j-1]) maxx=mat[i-1][j];
else maxx=mat[i][j-1];
mat[i][j]=maxx;
}
}
}
i=n;
j=m;
int cnt=0;
while(mat[i][j]!=0)
{
if(v1[i]==v2[j])
{
cnt++;
sol[cnt]=v1[i];
i--;
j--;
}
else
{
if(mat[i-1][j]==mat[i][j]) i--;
else j--;
}
}
printf("%d\n",cnt);
for(i=cnt;i>=1;i--) printf("%d ",sol[i]);
return 0;
}